1) The following page describes the differences between all the Vizard licenses:
http://www.worldviz.com/products/vizard/editions.html
The 2 major limitations of the trial edition is the watermark and fullscreen is only allowed for 20 seconds.
2) Sorry, I don't fully understand what you are asking. Are you saying that you cannot import your model into Vizard?
3) Yes. We recommend using the custom 3dsmax exporter that is available on our download page. It allows you to export your models into Vizards native file format (.ive/.osg). It supports baked lighting and other advanced features.